Superconductor Thought Impossible


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14Superconductor Thought Impossible

Non-trivial topology 
What is particularly exciting about the material, say the researchers, is the topological nature of 
how the superconductivity arises. The spin-3/2 quasiparticles are a result of topology related to the 
strong spin-
orbit coupling. Paglione also says, “the superconductivity that forms may itself have a 
non-
trivial topology”. “This is a more subtle thing and harder to prove,” he adds, “but essentially 
the phase of the superconducting wave function may have a ‘twist’ in it that gives a non-trivial 
(chiral) topology. This has profound implications, such as possibility of Majorana fermion 
excitations from the superconducting condens
ate.” 
 
READ MORE 
Type-II Dirac fermions spotted in two different materials 
Paglione says that spin-3/2 superconductivity could exist in other materials and the phenomenon 
could have technological and fundamental applications. If such superconductors are indeed 


topological, he believes that they could form the basis for fault-tolerant quantum computers. On a 
fundamental level, he says that spin-3/2 fermions provide a very rich spectrum of possible pairing 
configurations for physicists to study 
– adding that their work has already garnered significant 
interest from other physicists. 
Indeed, an important fundamental question, says Paglione, is how the spin-3/2 fermions pair up in 
the first place. “What’s the glue that holds these pairs together?” he asks. “There are some ideas of 
what might be happening, but fundamental questions remain 
– which makes it even more 
fascinating.” 
The research is described in 
Science Advances
. [16] 

 
A different spin on superconductivity
—Unusual particle interactions 

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